Fails to compile "x = 2 as number" when "as" starts a new line.

[arielshaqed]

TypeScript Version: typescript v2.9.0-dev.20180519

(Also with v2.8.3)

Search Terms:

"as keyword" newline
"as keyword" whitespace

Code

Fails:

const x = 2
as number;
console.log(x);

Works:

const x = 2 as
number;
console.log(x);

Expected behavior:
Successful compilation (and output "2"...).

Actual behavior:
tsnode says:

...(2,4): ';' expected. (1005)

Playground puts wiggly red lines on everything, starting on first as.

Playground Link: https://www.typescriptlang.org/play/#src=const%20x%20%3D%202%0D%0A%20%20as%20number%3B%0D%0Aconsole.log(x)%3B%0D%0A

Related Issues:
Couldn't find something similar (see search terms above). It looks related to the general weirdness associated with newlines in JavaScript. The playground seems to support this, it shows this translation:

x = 2;
as;
number;
console.log(x);

[j-oliveras]

This is because automatic semicolon insertion, so this is intended. The sample is parsed as:

const x = 2;
as number;
console.log(x);

but because as and number are not expected typescript shows errors (and try to do it's better to parse them).

[RyanCavanaugh]

Might be ASI concerns here, but I think we can safely parse an "as " from the next line?

[DanielRosenwasser]

No, this is the intended behavior:

• As operator #3201 (comment)
• d5bf689

[typescript-bot]

Automatically closing this issue for housekeeping purposes. The issue labels indicate that it is unactionable at the moment or has already been addressed.